3. Figure 5 shows part of the reactivity series of metals - Edexcel - GCSE Chemistry - Question 3 - 2023 - Paper 1

For magnesium: It typically reacts vigorously with dilute hydrochloric acid, producing hydrogen gas and forming magnesium chloride.

For zinc: Bubbles produced at a steady rate indicate a reaction, with zinc reacting to produce hydrogen gas as well.

For iron: A slight increase in temperature (test tube feels slightly warm) suggests that a reaction is occurring, though less vigorous than zinc.

For copper: The absence of reaction indicates that copper does not react with dilute hydrochloric acid.